I noticed that Pisto said in a previous post that the talk was to be on the morning of 14 February. I had always assumed that it was going to be that night.
"On Steenkamp had been scheduled to give a motivational speech to students in Johannesburg. "It was about empowerment and inspiration and what inspires you and how to follow your dreams," said Tomlinson, who had Steenkamp's notes for the speech."
http://www.theguardian.com/world/2013/feb/14/reeva-steenkamp-friends-shock-at-loss
So why did Reeva feel the need to give OP his Valentine's Day present the night before?
I had assumed that she was going to be busy that night giving the talk so she could not see him. So going out with friends the night before makes sense now as they could then still see each other on the night of the 14th.
Surely Reeva would have wanted to practise her speech and go to bed early in preparation.
Perhaps Reeva wanted to talk to OP about his phoning her twice while she was with Warren Lahoud the day before initially. I think she must have had something on her mind she needed to talk about. Then later, I still predict that Reeva caught OP taking performance-enhancing drugs and she lost total respect for him then smashed his trophies. Her idol was exposed as a fake! What else could lead to a seven-hour argument? OP decided that RS had to go. What would be the most important thing to OP? His medals which, if exposed, he could lose. That was everything he had to live for!